NH Extension Field Specialist George Hamilton described why and how to calibrate air blast sprayers. Hamilton spoke at the USDA Farm Service Agency (FSA) headquarters in Warwick, RI. Hamilton said his Extension office received a calibrating tool thanks to the New England Vegetable & Fruit Growers Association.
Like every pesticide label advises, Hamilton urged farmers and growers to calibrating their sprayer regularly. This will ensure effective, efficient, economical and legal spraying. Poor spray results is generally caused by poor spray coverage. Overuse of some sprays can lead to unhealthy residues and/or fines.
Hamilton recommends calibrating equipment at the beginning and middle of every growing year – at the minimum. A fresh calibration is needed whenever changing nozzles, operating pressure and/or tractor or trailer wheels. New tractor tires can affect the speed (and tachometer) 10 to 20 percent. [Learn more here.]